From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Fri, 8 Apr 2016 11:28:42 +0000 (+0200)
Subject: net: ethernet: renesas: ravb_main: test clock rate to avoid division by 0
X-Git-Tag: v4.6-rc5~19^2~39
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a6d37131c02f15463daa00e2f1da6824e8e00de2;p=karo-tx-linux.git

net: ethernet: renesas: ravb_main: test clock rate to avoid division by 0

The clk API may return 0 on clk_get_rate, so we should check the result before
using it as a divisor.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 087e14a3fba7..9e2a0bd8f5a8 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1691,6 +1691,9 @@ static int ravb_set_gti(struct net_device *ndev)
 	rate = clk_get_rate(clk);
 	clk_put(clk);
 
+	if (!rate)
+		return -EINVAL;
+
 	inc = 1000000000ULL << 20;
 	do_div(inc, rate);